Pulmonary edema is an accumulation of fluid within the parenchyma and air spaces of the lungs. Classically it is cardiogenic (left ventricular) but fluid may also accumulate due to damage to the lung.
Crystal Light sells a Metabolism-Plus product designed to increase your metabolism. The Green Tea Peach Mango flavored drink has 25 mg of caffeine per 8-oz. serving. Crystal Light also sells a variety of tea flavors. Made with tea, which contains caffeine, these products contain 10 to 15 mg of caffeine per 8-oz. serving, except for those that are labeled as caffeine free.
If there's is 30 mg of caffeine per 8 oz cup of green tea, drinking the recommended amount translates into 60 mg of caffeine per day (much less than 300 mg), and even that caffeine level can be reduced by following the instructions in this article. Here is a comparison of caffeine content is various beverages.